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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

39364 results found.

  1. GRB 231104A: Wendelstein Optical/Infrared Observations
  2. GRB 231104A: NuSTAR Observation of the prompt emission
  3. GRB 231106A: Fermi GBM Final Real-time Localization
  4. GRB 231104A: 3.6m DOT optical upper limit
  5. GRB 231104A: NOT upper limit
  6. GRB 231104A: Fermi GBM Observation
  7. GRB 231104B: Fermi GBM Final Real-time Localization
  8. Fermi GRB 231103A: Global MASTER-Net observations report
  9. GRB 231104A: AKO Upper Limit
  10. GRB 231104A: AstroSat CZTI detection
  11. GRB 231104A: Swift-XRT refined Analysis
  12. GRB 231104A: Fermi-LAT detection
  13. GRB 231104A: Swift/UVOT Upper Limits
  14. GRB 231104A: Enhanced Swift-XRT position
  15. GRB231104A: LCOGT Optical Upper Limits
  16. GRB 231104A: Swift detection of a bright burst
  17. GRB 231104A: Fermi GBM Final Real-time Localization
  18. Swift GRB231104.07: Global MASTER-Net observations report
  19. IceCube Alert 231103.39: Global MASTER-Net observations report
  20. GRB 231103A: Fermi GBM Final Real-time Localization
  21. IceCube-231103A - IceCube observation of a high-energy neutrino candidate track-like event
  22. Fermi-LAT gamma-ray observations of IceCube-231027A
  23. LIGO/Virgo/KAGRA S231102i: Global MASTER-Net observations report
  24. GRB 231101A: Glowbug gamma-ray detection
  25. GRB 231024A: GRANDMA observations of AT2023vuc/GOTO23baj candidate
  26. Fermi trigger No 720498201: Global MASTER-Net observations report
  27. GRB 231101A: Fermi GBM Final Real-time Localization
  28. GRB 231030B: GRBAlpha detection
  29. GRB 231028B: VZLUSAT-2 detection
  30. Fermi trigger No 720415645: Global MASTER-Net observations report
  31. GRB 231030B: Fermi GBM Detection
  32. GRB 231030B: AstroSat CZTI detection
  33. Fermi GRB 231030B: Global MASTER-Net observations report
  34. IPN triangulation of GRB 231020A
  35. GRB 231030B: BALROG localization (Fermi Trigger 720388704 / GRB 231030832)
  36. GRB 231030B: Fermi GBM Final Real-time Localization
  37. GRB 231028A: Swift-BAT refined analysis
  38. LIGO/Virgo/KAGRA S231029y: Upper limits from Swift/BAT-GUANO
  39. GRB 231024A: AKO Optical Counterpart Candidate
  40. GRB 231028A: CALET Gamma-Ray Burst Monitor detection
  41. Fermi GRB 231030A: Global MASTER-Net observations report
  42. GRB 231030A: Fermi GBM Final Real-time Localization
  43. LIGO/Virgo/KAGRA S231029y: One counterpart neutrino candidate from IceCube neutrino searches
  44. LIGO/Virgo/KAGRA S231029ai: Global MASTER-Net observations report
  45. GRID detection of GRB 231020A
  46. LIGO/Virgo/KAGRA S231029k: Global MASTER-Net observations report
  47. GRB 231028A: AstroSat CZTI detection
  48. GRB 231028A: Glowbug gamma-ray detection
  49. GRB 231028A: Fermi GBM Detection
  50. Fermi trigger No 720224759: Global MASTER-Net observations report
  51. Swift GRB 231028A: Global MASTER-Net observations report
  52. GRB 231028A: Swift detection of a burst
  53. GRB 231028A: Fermi GBM Final Real-time Localization
  54. IceCube Alert 231027.18: Global MASTER-Net observations report
  55. IceCube-231027A - IceCube observation of a high-energy neutrino candidate track-like event
  56. LIGO/Virgo/KAGRA S231025t: Global MASTER-Net observations report
  57. LIGO/Virgo/KAGRA S231025a: Global MASTER-Net observations report
  58. GRB 231019A: Glowbug gamma-ray detection
  59. GRB 231025A: Fermi GBM Observation
  60. GRB 231024A: Fermi GBM Observation
  61. GRB 231025A: Swift/BAT-GUANO detection of a likely short burst
  62. GRB 231025A: Fermi GBM Final Localization
  63. GRB 231024A: X-shooter spectroscopy of AT2023vuc/GOTO23baj reveals a young supernova with flash ionisation features
  64. GRB 231024A: LCOGT and ZTF detections of the GOTO optical counterpart candidate
  65. GRB 231020A: AstroSat CZTI detection
  66. GRB 231020B: AstroSat CZTI detection
  67. GRB 231024A: GOTO optical counterpart candidate
  68. GRB 231024A: Fermi GBM Final Localization
  69. Fermi trigger No 719846439: Global MASTER-Net observations report
  70. GRB 231018A: Swift/BAT-GUANO detection of a long burst outside the coded FOV
  71. LIGO/Virgo/KAGRA S231020bw: Upper limits from Swift/BAT-GUANO
  72. GRB 231020A: Fermi GBM Detection
  73. GRID detection of GRB 231004A
  74. GRB 231017A: Mondy optical observations. A possible candidate for an afterglow or host galaxy.
  75. GRB 231019A: VZLUSAT-2 detection
  76. GRB 231018A: VZLUSAT-2 detection
  77. GRB 231020B: BALROG localization (Fermi Trigger 719530557 / GRB 231020900)
  78. GRB 231020B: Fermi GBM Final Real-time Localization
  79. GRB 231020A: BALROG localization (Fermi Trigger / GRB 231020790)
  80. LIGO/Virgo/KAGRA S231020ba: Upper limits from Fermi-GBM Observations
  81. GRB 231015A: NuSTAR Detection of Prompt Emission
  82. Fermi GRB 231020A: Global MASTER-Net observations report
  83. LIGO/Virgo/KAGRA S231020bw: Identification of a GW compact binary merger candidate
  84. GRB 231020A: Fermi GBM Final Real-time Localization
  85. GRB 231012A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705709044)
  86. GRB 231017A: 1.3m DFOT Optical upper limit
  87. IceCube-231004A: Upper limits from Fermi-GBM Observations
  88. GRB 231018A: GRBAlpha detection
  89. GRB 231018A: CALET Gamma-Ray Burst Monitor detection
  90. Fermi GRB 231019A: Global MASTER-Net observations report
  91. GRB 231018A: Glowbug gamma-ray detection
  92. Konus-Wind detection of GRB 231018A
  93. IPN triangulation of GRB 231018A
  94. GRB 231017A: Swift/UVOT Upper Limit
  95. GRB 230911C: ATCA detection of possible radio counterpart
  96. GRB 231019A: Fermi GBM Final Real-time Localization
  97. GRB 231017A: GOTO optical upper limits
  98. GRB 231017A: JinShan optical upper limit
  99. GRB 231018A: GROWTH-India Follow-Up of a Fermi Long GRB
  100. GRB 231017A: Las Cumbres optical upper limit

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